| 摘要 |
A fuel cell system is provided to prevent a stack from undergoing degradation in the quality thereof due to an insufficient air moistening condition or exhaust of cooling water. A fuel cell system comprises: a stack(13) for generating electricity through electrochemical reactions between air supplied from a duct and moistened in a moistener(12) and hydrogen depressurized in the middle of the duct; a circulation duct linked between the stack and the moistener to supply moistened exhaust gas discharged from the stack to the moistener; and a cooling water circulation duct connected to the stack in a loop shape and having a cooling water reservoir(19), and further comprises: a water producing unit(20) connected to each duct through a branch duct equipped with a solenoid valve(28a) and a control valve(28b), and receiving the air and hydrogen to produce water; a water supply unit(30) connected to the moistener and the cooling reservoir through a main duct having a circulation pump(33) and connected to the water producing unit, wherein a sub-branch duct(35a,35b) is connected in parallel to the outlet of the circulation pump through a three-way valve(34); and a controller(40) into which output signals from a high-water level sensor(A) and a low-water level sensor(B) each mounted to the moistener and cooling water reservoir are input to control the solenoid valve, control valve, circulation pump and three-way valve. |
